4X5N

Crystal structure of SemiSWEET in the inward-open and outward-open conformations


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.281 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural basis for the facilitative diffusion mechanism by SemiSWEET transporter

Lee, Y.Nishizawa, T.Yamashita, K.Ishitani, R.Nureki, O.

(2015) Nat Commun 6: 6112-6112

  • DOI: 10.1038/ncomms7112
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • SWEET family proteins mediate sugar transport across biological membranes and play crucial roles in plants and animals. The SWEETs and their bacterial homologues, the SemiSWEETs, are related to the PQ-loop family, which is characterized by highly con ...

    SWEET family proteins mediate sugar transport across biological membranes and play crucial roles in plants and animals. The SWEETs and their bacterial homologues, the SemiSWEETs, are related to the PQ-loop family, which is characterized by highly conserved proline and glutamine residues (PQ-loop motif). Although the structures of the bacterial SemiSWEETs were recently reported, the conformational transition and the significance of the conserved motif in the transport cycle have remained elusive. Here we report crystal structures of SemiSWEET from Escherichia coli, in the both inward-open and outward-open states. A structural comparison revealed that SemiSWEET undergoes an intramolecular conformational change in each protomer. The conserved PQ-loop motif serves as a molecular hinge that enables the 'binder clip-like' motion of SemiSWEET. The present work provides the framework for understanding the overall transport cycles of SWEET and PQ-loop family proteins.


    Organizational Affiliation

    Department of Biological Sciences, Graduate School of Science, University of Tokyo, 2-11-16 Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Uncharacterized protein
A, B, C, D
100Escherichia coli (strain UMEA 3162-1)Mutation(s): 0 
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
SWEET and semiSWEET Transporters, and Their Relatives
Protein: 
semiSWEET transporter in inward-open conformation (crystal I)
Find proteins for P0DMV3 (Escherichia coli (strain UMEA 3162-1))
Go to UniProtKB:  P0DMV3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Free: 0.328 
  • R-Value Work: 0.281 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 118.010α = 90.00
b = 34.630β = 102.93
c = 123.220γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-01-21
    Type: Initial release
  • Version 1.1: 2015-02-11
    Type: Database references